Tuesday afternoon, O'Donnell, 53, posted on her website, rosie.com, that police in Nyack, where the former "View" co-host and her family live, were searching for 17-year-old Chelsea O'Donnell, who was last seen last Tuesday, Aug. 11.

"She was wearing a black sweatshirt hoodie, dark ripped blue jeans, women's gray converse sneakers and a black backpack," the notice said. "Chelsea has a large tattoo on her right side of a dream catcher with the word 'Breathe.' She left home with her 6-month-old therapy dog named Bear. The dog is a 9 lb. brown and black terrier. Chelsea stopped taking her medicine and is in need of medical attention. Any information please contact authorities at 845-358-0206 or 911."

Early Tuesday afternoon, Commack native O'Donnell added on her Facebook page, "My daughter Chelsea and her dog Bear -- last seen in Nyack, New York -- may be in NYC" and gave the phone numbers above.

O'Donnell adopted Chelsea Belle in 1997. The comedian has four other children: Parker Jaren, adopted in 1995; Blake Christopher, adopted with then-partner Kelli Carpenter in 1999; Vivienne Rose, born to Carpenter through artificial insemination; and daughter Dakota, adopted in January 2013 by O'Donnell and her then-wife, Michelle Rounds.